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New information about secondary particle formation from natural gas engine exhaust

New information about secondary particle formation from natural gas engine exhaust

Aerosol mass (PAM) chamber was utilized to investigate the secondary aerosol formation of natural gas retro-fitted engine exhaust.

Natural gas usage in the traffic and energy production sectors is a growing trend worldwide; thus, an assess ment of its effects on air quality, human health and climate

is required. Engine exhaust is a source of primary particulate emissions and secondary aerosol precursors, which both contribute to air quality and can cause adverse health effects.

The total mass of particles measured downstream of the PAM chamber was 6–268 times larger than the mass of the emitted primary particles. The aged particles consisted mainly of organic material, nitrate, sulfate and ammonium, their mass contributions depending on exhaust after-treatment and engine parameters. Engine operating mode, catalyst temperature and type also have impact on volatility and concentration of the total aged particles. The volatility of the total aged particles was lower than that of primary particles, suggesting that they were more stable in the atmosphere.

More information:

Researcher Sanna Saarikoski,

Alanen, J., Simonen, P., Saarikoski, S., Timonen, H., Kangasniemi, O., Saukko, E., Hillamo, R., Lehtoranta, K., Murtonen, T., Vesala, H., Keskinen, J., Rönkkö, T. Comparison of primary and secondary particle formation from natural gas engine exhaust and of their volatility characteristics. Atmos. Chem. Phys., 17, 8739–8755, 2017 


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Contact information

Scientific Director Ari Laaksonen
tel. +358 539 5530

Meteorological and Marine Research Programme
Director Sami Niemelä
tel. +358 29 539 4172

Climate Research Programme
Director  Hannele Korhonen
tel. +358  29 539 2135

Space and Earth Observation Centre
Director Jouni Pulliainen
tel. +358 29 539 4701

Science News
Communications Specialist Eija Vallinheimo
tel. +358 29 539 2231

FMI publications

FMI´s own publications series are:

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All publications from 2016 onwards can be found on Helda.